Safety device for elevators.



PATBNTBD MAY 15, 1906.

A. D. GABLB & J. BRIGKLEY.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION nun) FEB. 9. 190a.

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I F V II INVENTOR/S/ I PATENTED MAY 15, 1906.

A. D. GABLE & J. BRIGKLEY.'

SAFETY DEVICE FOR ELEVATORS. APPLICATION nun rm. 9. 1906.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

AUGUSTUS D. GABLE AND JOHN BRICKLEY, OF SHENANDOAH, PENNSYL- VANIA.

SAFETY DEVICE FOR ELEVATORS- Specification of Letters Patent.

Lratented. May 15, 1906.

To all whom it may concern:

Be it known that we, AUGUSTUS D. GABLE and J OHN BRICKLEY, citizens ofthe United States, residing at Shenandoah, in the county of Schuylkilland State of Pennsylvania, have invented certain new and usefulImprovements in Safety Devices for Elevators; and we do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecification, and to the letters of reference marked thereon.

The present invention has relation to safety devices for elevators, andhas for its object to provide a simple and effective means forautomatically arresting the descent of the elevator in the event of thehoisting-cable breaking, and thereby prevent any accident happening orresulting therefrom.

The invention consists in a safety device for elevators constructedsubstantially as shown in the drawings and hereinafter described andclaimed.

Figure 1 of the drawings is a perspective view of an elevatorconstructed in accordance with our invention; Fig. 2, a side viewthereof, partly in section; Fig. 3, a top plan view.

In the accompanying drawings the cab or cage of the elevator consists ofthe side walls A and the platform B, which may be of any suitableconstruction, the side walls being connected by a transversebracing-frame C, near the upper ends thereof.

Two longitudinal -transverse rotatable shafts D E have their bearings inthe side walls A and extend out beyond the same and are spring-actuatedthrough the medium of coiled springs a, which encircle said shafts, oneend of the springs being secured to the shafts and the opposite endssecured to the side wall of the cab or cage. At or near the center ofthe shafts are suitably connected thereto grooved pulleys, the pulley Fbeing secured to the shaft D and the pulley G to the shaft E, andextending over these grooved pulleys are chains 5, with their endsconnected to said pulleys, as shown in Fig. 3 of the drawings. Connectedto the chains b are chains 0, the ends thereof being fastened in anysuitable manner to suitable bolts d, which extend transversely throughthe bracing-frame C, and a hoisting-cable is secured to said chains, asshown in Fig. 1 of the drawings, or any vided with serrated faces andmay be of any suitable construction, said clutches working 1n groovedcam-brackets O, which are secured to the'side walls A on an incline, sothat the brackets will act as cams against the clutches as the cab orcage descends. The clutches above described are connected to chains e,and said chains are in turn connected to the grooved pulleys H I uponthe projectirig ends of the rotatable shafts D E.

The side walls A of the cab or cage are provided with grooved guides Pto engage the stationary standards J, so that the cab or cage will beguided in its vertical movement. The clutches (represented at K, L, M,and

'N) are provided with T-shaped tongues f, as

shownin Fig. 3 of the drawings,which engage similarly-formed grooves gin the cam-brackets O.

The spring-actuated shafts D E are designed to draw the clutches upwardthe moment the cable breaks, as when the shafts are released fromtension through the upward pull on the chains the spring on said shaftswill cause the shafts to turn in the direction to wind up the chainsupon the pulleys H I and carry upward the clutches, and through themedium of the grooved cam-guides O the serrated or toothed faces of theclutches will be brought against the standards J, and upon anydownward-movement of the cab or cage the clutches will be brought incloser contact with the standards.

Through the medium of the grooved came guides the clutches are operatedby the spring actuated shafts hereinbefore described and also by anydownward movement of the cab or cage, providing a double means ofsecurity against the descent of the cab or cage.

Having now fully described our invention,

what we claim as new, and desire to secure by Letters Patent, is 4 Asafety device for elevators, comprising a suitable cab or cage,spring-actuated rotatable shafts, pulleys upon said shafts between theside walls of the cab or cage, flexible connections engaging thepulleys, pulleys upon the outer ends of the shafts, grooved cambracketsarranged in vertical pairs upon each side of the walls of the cab orcage, clutches arranged in pairs at the upper and lower ends of the cabor cage upon both sidesthereof, each pair of said clutches beingconnected with each other and the several pairs to the pulleys upon theends of the rotatable shafts whereby the clutches will operatesimultaneously, substantially as and for the purpose set forth.

In testimony whereof we afiiX our signatures in presence of twowitnesses.

Witnesses: V

W. T. LEE, MAX LEVIT.

